Z8F042AHJ020SC00TR Zilog, Z8F042AHJ020SC00TR Datasheet - Page 26

• Manufacturer Part Number: Z8F042AHJ020SC00TR
• Description: IC ENCORE XP MCU FLASH 4K 28SSOP
• Manufacturer: Zilog
• Series: Encore!® XP®r

Specifications of Z8F042AHJ020SC00TR

• Core Processor: Z8
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: IrDA, UART/USART
• Peripherals: Brown-out Detect/Reset, LED, LVD, POR, PWM, Temp Sensor, WDT
• Number Of I /o: 23
• Program Memory Size: 4KB (4K x 8)
• Program Memory Type: FLASH
• Eeprom Size: 128 x 8
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 3.6 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 28-SSOP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: Z8F042AHJ020SC00T

Address Space
Register File
Program Memory
PS022825-0908
The eZ8 CPU can access the following three distinct address spaces:
1. The Register File contains addresses for the general-purpose registers and the eZ8
2. The Program Memory contains addresses for all memory locations having executable
3. The Data Memory contains addresses for all memory locations that contain data only.
These three address spaces are covered briefly in the following subsections. For more
information on eZ8 CPU and its address space, refer to eZ8 CPU Core User Manual
(UM0128) available for download at www.zilog.com.
The Register File address space in the Z8 Encore!
Register File is composed of two sections: control registers and general-purpose registers.
When instructions are executed, registers defined as sources are read, and registers defined
as destinations are written. The architecture of the eZ8 CPU allows all general-purpose
registers to function as accumulators, address pointers, index registers, stack areas, or
scratch pad memory.
The upper 256 bytes of the 4 KB Register File address space are reserved for control of the
eZ8 CPU, the on-chip peripherals, and the I/O ports. These registers are located at
addresses from
section are reserved (unavailable). Reading from a reserved Register File address returns
an undefined value. Writing to reserved Register File addresses is not recommended and
can produce unpredictable results.
The on-chip RAM always begins at address
Z8 Encore! XP
Reading from Register File addresses outside the available RAM addresses (and not
within the control register address space) returns an undefined value. Writing to these
Register File addresses produces no effect.
The eZ8 CPU supports 64 KB of Program Memory address space. The Z8 Encore! XP
F082A Series devices contain 1 KB to 8 KB of on-chip Flash memory in the Program
Memory address space, depending on the device. Reading from Program Memory
CPU, peripheral, and general-purpose I/O port control registers.
code and/or data.
®
F00H
F082A Series devices contain 256 B to 1 KB of on-chip RAM.
to
FFFH
. Some of the addresses within the 256 B control register
000H
®
in the Register File address space. The
MCU is 4 KB (4096 bytes). The
Z8 Encore! XP
Product Specification
®
F082A Series
Address Space
15